/usr/lib/libmusicbrainz3.so.6 is in libmusicbrainz3-6v5 3.0.2-2.5.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libmusicbrainz3.so.6.2.0
/usr/lib/libmusicbrainz3.so.6.2.0